Bark-removing drum having welded hoop construction



y 1954 G. M. DICK 2,684,092

BARK-REMOVING DRUM HAVING WELDED HOOP CONSTRUCTION Filed Dec. 30, 1948 l0 l I20 2| INVENTOR GEORGE M- DICK.

HIS ATTORNEY.

Patented July 20, 1954 BARK-REMOVING DRUM HAVING WELDED HOOP CONSTRUCTION George M. Dick, Sherbrooke, Quebec, Canada, assignor to Ingersoll-Rand Company, New York, N. Y., a corporation of New Jersey Application December 30, 1948, Serial No. 68,290

3 Claims.

This invention relates to log barking devices and more particularly to the drums of log barking devices. Heretofore, drums for devices of the type to which this invention appertains were generally fabricated by riveting. However, this mode of assembly has several known disadvantages, such as the time delay incurred in drilling the'rivet holes and the weakening of the members in which such holes are formed. It is, accordingly, one object of this invention to provide a log barking drum of welded construction.

Another object of this invention is to assemble the various members of the drum in such a manner that the transfer of stresses therebetween is a gradual rather than abrupt process.

Further objects of this invention will become obvious in the following specification and accompanying drawing in which,

Figure 1 is a side view of a log barking drum constructed in accordance with the practice of the invention,

Fig. 2 is a longitudinal elevation, in section, of the drum,

Fig. 3 is a transverse view taken through Figure 2 along the line 3--3 looking in the direction of the arrows, and

Fig. 4 is an enlarged detail of the drum.

Referring to the drawing, it indicates a cylindrically shaped log barking drum mounted on flanged rollers ll, positioned on the opposite sides and at the opposite end portions of the drum i0, and in which ride annular tracks or tires l2 encircling the drum In and mounted thereon. Rotation of the drum It] is facilitated by means of a girth gear It encircling and secured to the drum l and engaging a drive pinion l4 mounted on the drive shaft [5 supported by the members l6 and rotated by a motor (not shown).

With this arrangement, logs I! within the drum it are tumbled about and the bark is stripped from the logs I1 due to the relative longitudinal and rotational movement therebetween. To assure further that the logs I! will be stripped clean in passing through the drum Ill, longitudinally disposed ribs, or staves, l8 are mounted on the inner periphery of the drum l0 thereby presenting an irregular surface to the log H for increasing or accentuating relative movement between the logs ll. To this end, the staves l8 have a generally U-shaped cross sectional form and the marginal or free end portions l9 are turned outwardly to provide surfaces in face relation with and to seat against the inner periphery of the collar, or hoops, 28 to which they are secured.

The hoops 20 are positioned at predetermined spaced intervals with respect to each other along the length of the staves l8-the space between the hoops 20 being determined by the strength of the staves l8. It is on these hoops that the girth gear l3 and the tires l2 are mounted. The ends of the staves [8 are secured to end covers 2! having central openings 22 through which the logs H are loaded in the drum in and dumped therefrom. The diameter of the opening 22 is somewhat less than the inner diameter of the drum I 8 thereby providing a rim or internal flange l2! at the opposite ends of the drum ill to retard the movement of the logs I! through the drum I0.

In the form of the invention as shown, the staves l3 are welded to the hoops 20 and the end covers 2! and in order to prevent the abrupt transfer of load or stress therefrom to the staves IS, the marginal portions, indicated in general by I20, of the hoops 2i and the inner marginal portions, indicated in general by I22, 0f the end covers 2| are in the form of laterally extended fingers 23 which decrease in width in the outwardly direction. The distance between outer edges of a pair of fingers, measured at the roots, or base, of the fingers, is substantially equal to the width of a stave is. The staves it are then mounted with the center lines of the marginal portions l9 along the center lines of the fingers 23, as best seen in Figure 4, and the edges of the marginal portion is are welded along the inner surface of the hoops 20 and the end covers 2| to a point where the fingers 23 are of less width than the marginal portions l9, at which point the weld crosses over from the edge of the marginal portions 19 to secure the edges of the fingers 23 to the outer surface of the marginal portions I9. Inasmuch as the fingers 23 lie in the same plane as the plane of the hoops 20, the edges of the marginal portions 19 may also be welded to the inner peripheral surfaces of the hoops 2% (see Fig. 4:).

With this arrangement, the transfer of stresses from the hoops 20 to the staves I8 is a gradual process-that is to say, due to the taper and flexibility of the fingers 23, the load stresses in the hoops 29 are gradually assumed by the staves l8 thereby obviating the danger of failure in the staves at this point due to the abrupt transfer of stresses between the hoop Z9 and the staves l8. The distance or space between pairs of fingersby pair it is meant any two fingers on which a stave I8 is mounted-is suilicient to allow the passage of bark stripped from the logs ii to pass between the staves Is and free of the drum I0.

It is clear from the previous discussion that a log barking drum constructed in accordance with the practice of the invention, accomplishes, among others, the objects hereinbefore stated and is capable of prolonged operation without the danger of fracture to the staves 18 due to adverse or abrupt loading at the marginal portions of the hoops 20 and end covers 2|.

While I have shown and described a specific form of my invention, it is to be understood that various changes and modifications may be made without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. A drum comprising, a plurality of hoops spaced relative to each other, fingers integral with the hoops and extending laterally outward from the opposite edges thereof, and staves of generally U-shaped cross sectional form extending laterally between said hoops, the marginal portions of said staves being turned outwardly to provide surfaces in face relation with the inner surface of said fingers and welded thereto.

2. A log barking drum comprising, a plurality of hoops spaced relative to each other, the marginal portions of said hoops being of the form of fingers extending laterally of the hoop, said fingers being tapered laterally outward, and staves of generally U-shaped cross-sectional form longitudinally disposed on the periphery of said hoops and extending therebetween, the marginal portions of said staves being turned to provide surfaces in face relation to surfaces on said fingers and the edges and said surfaces of the fingers being welded to the marginal portions of the staves.

3. A log barking drum comprising, a plurality of hoops spaced relative to each other and having laterally extended finger shaped marginal portions, the fingers of said marginal portions being tapered laterally outward, and staves of generally U-shaped cross-sectional form longitudinally disposed on the inner periphery of said hoops and extending therebetween, the marginal portions of said staves being turned outwardly to provide surfaces in face relation to the inner surfaces on said fingers, said fingers being welded to said marginal portions.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,311,226 Guettler July 29, 1919 2,208,004 Koebke July 16, 1940 

